Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc hieu che snippets" » "toc thieu che snippets", "hoc thieu che snippets", "hoc hien che snippets", "doc hieu chi snippets", "doc dieu che snippets", "doc hieu he snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doc hieu che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc hieu che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc hieu che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc hieu che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.